Hi everyone, i'm having a problem with my Sony DB945 (gotta check model number -not sure if that's right. When watching DVD's, with sound output via optical lead, the Amp will randomly flash 'unlock' on it's diaplay, and, produce no sound output (while unlock is displayed). A bit of a pain! I'm sure I remember reading an 'lock/unlock' option on the amp?.. but have been unable to find this information again Any ideas for solving this problem? Thanks, Steve.